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Apparently, translations for all 4 volumes of this official novel/omake have already been released and translated by fans from various sources. The events that occur within each volume are said to take place between the 17 month gap of the Deicide arc and the Tale of the Lost Agent arc. Fan translated summaries for each volume have also been provided. Credit for the following brief summaries and for the lengthened fan translated summary for volume 4 goes to verduister from narutofan.

Volume 1:

Quote:

Brief intro: A captain meeting takes place. Apparently the name Kenpachi is passed on to every new 11th division captain. And former captain, Azashiro Kenpachi, who was imprisoned in the Muken has disappeared.

Volume 2:

Quote:

Brief intro: After his defeat Aizen was imprisoned in the Muken. There Aizen talks with Azashiro Kenpachi and a woman in a white kimono.

Volume 3:

Quote:

Brief intro: Don Kanonji runs into a female Hollow at an abandoned hospital. Unbeknownst to him this meeting will lead him to a path full of danger.

Volume 4:

Quote:

Soul Society is shaken by the attack of a mysterious Arrancar----

The person who appears at the Research and Development Institute is----

I haven't been able to find a translation for vol.3 that I can copy & paste here. I only found a scanlation for it. So I'm not going to link to it since I believe that's against forum policies. If you're diligent enough, you should be able to find it yourself though.

For the first 2 volumes, I wasn't able to find the username of the person who initially provided translations for it. If someone finds out, let me know, and I'll edit this post accordingly to give credit where its due.

Spoiler for Spirits are Forever With You Vol.1:

Narration: "Bleach" final-release "Missing Link Project" Starts!!

Revealing Narita-sensei's novel, which features the period of 17 months of vol. 48~49, in the 4th issue of Jump.

-Emergency special report-

The 17 month-long truth post Ichigo's loss of reiryoku is now revealed!!

"Spirits Are Forever With You" Vol. 01

Narration: The place is the 1st division waiting room, where the 13 captains gather.

(If I were to make the translation smoother, it would be: "The story takes place at the 1st division waiting room, where the 13 captains gather.")

The threat nears the Soul Society-------------

7 minutes after (presumably the time after the person's escape), 1st division waiting room

Captain-Commander: It's an urgent situation!

Narration: Following a loud thump, caused by the captain commander striking the floor with the end of his staff, Yamamoto Genryusai Shigekuni let out his voice around the inner parts of the waiting room. The people who were gathered here are the captains who were gathered for an emergency. Regardless of the absence of disease-stricken Ukitake, Kenpachi and Mayuri, who were both absent for no reason at all, and even with the faces of the regular-attendees made the place utterly defenseless. Because even the time it takes to wait for the other captains to make their arrival at the place seemed wasteful, Genryusai began the captain's meeting. Having answered Genryusai's glare, Soi Fon released her report coolly.

Soi Fon: According to the investigation engaged by Onmitsukido, the treasonous sinner, Azashiro Kenpachi's presence has affirmed to have vanished from the 'Mugen. Starting with the Aizen Sousuke to other convicts, there's no signs of their escapement. Presently, the order has been given unto every squad members for Azashiro's search.

Narration: Azashiro Kenpachi. The ones who had their expressions changed were the following: Unohana Retsu, the captain of the 4th division, Shunsui Kyoraku, the captain of the 8th division, and Hirako Shinji, Ootoribashi Rose, Muguruma Kensei, who were restored to their respective captain ranks in recent times, thus totaling five.

Hirako: My my, an extremely nostalgic name popped up. That's the guy who had been captured before I became the captain.

Rose: Yes, it's the event that's been 200 years already.

Kensei: Was it the time back when we became seated officers? That bastard erupted a rebellion or some shit and were sent to Mugen as a result.

Narration: In contrast to Hirako's gang, who seemed to be talking about a person from the long-forgotten past, Unohana, who has held the title of captain longer than they, was mumbling while her expression was drenched in her shadow.

Unohana: Azashiro Kenpachi....To think that that name would be heard at a time as early as now.

Narration: Meanwhile, Kyoraku, keeping his silence, thinks while he lowers his hat beneath his face.

Kyoraku: This is really bad. As expected, was that child an ominous premonition to come?

Narration: Kyoraku gave out a long sigh, as he thought about the arrancar girl he saw at the Ugendo shortly before. No.......It's rather natural to think that there's a connection between the two events than to believe that it was a mere coincidence that it happened following the prior one. Other captains talked to one another, while Kyoraku immersed himself in his own thoughts.

Toshiro: It's a bastard whom I am not aware of. "Kenpachi," what joke is this? Or is this a mere coincidence?

Narration: As Hitsugaya Toshiro mumbled while putting on a blunt expression on his face, Kuchiki Byakuya, too, with a blunt expression, answered his question.

Byakuya: Certainly, the name, "Kenpachi," is a name that's inherited by defeating the previous name-holder in a duel....There cannot be a situation where two people with the name, "Kenpachi" walking and alive in the same time-period.

Narration: Following Byakuya's words, Genryusai opened his mouth.

Captain-Commander: That's correct. That very exception is Azashiro Kenpachi.

Narration: Having opened his eyes slightly, the captain-commander began to talk with a heavier tone.

Captain-Commander: He inherited the name after having felled Kuruyashiki Kenpachi, the 7th, in a duel.......He, however, was not cut down by anyone. After he had committed the grave crime, his very existence had been buried deep inside the prison, Mugen, the vice-captain of 11th of that time had been made into the 9th Kenpachi in order to keep the Kenpachi name alive.

Narration: Naturally following the previous person's story, Kyoraku, who had released himself from his thoughts, began to talk to Hitsugaya Toshiro, and to other captains.

Kyoraku: That 9th had been cut down by the strong one of the Rukongai, who had called himself Kiganjou. The one who had defeated that strong of the strong Kiganjou is Kenpachi-captain of the present time.

Toshiro: Let me ask you by skipping the formality. From your viewpoint, is that bastard called, "Azashiro," more cumbersome than Zaraki?

Narration: To Hitsugaya, who was questioning while keeping his eyes opened keenly, Kyoraku rubbed his chin with a crooked smile on his face.

Kyoraku: Even if you were to ask something without the formalities, that's a bit......Both Azashiro, the previous captain, and captain Zaraki are too special. More than anything, we don't even know the names of their zanpakuto's. And as for Azashiro-kun, we haven't even seen his sword.

Toshiro: Sword? By, "sword," do you mean to say, "shikai?"

Kyoraku: No, that's exactly what it means. He didn't keep it with him. The zanpakuto, that is. "To explain this in a specific manner, he, indeed, kept his zanpakuto, but it was not seen by our eyes," something like that, or at least that's how the story goes.

Narration: In reaction to Kyoraku's words, the 7th division captain, Komamura Saijin, who was keeping his silence, raised his beastly ears and opened his mouth.

Komamura: Could it be.......that it's an illusion-type zanpakuto such as Aizen's Kyoka Suigetsu?

Kyoraku: That's certainly possible, however, he has never revealed that secret. Even at the urges of the Central 46, he refused to say anything further with a simple line, "I've already shown it."

Toshiro: That Central 46 ended the ordeal with only that?
Narrataion: As if he had a certain viewpoint about the Central 46, Hitsugaya asked as though he was surprised. Kyoraku, having affirmed Hitsugaya's surprised question as something acceptable, he gave an answer while he sighed.

Kyoraku: The thing that allows such arbitrariness is the name, "Kenpachi." Kiganjou-kun, who was 10th, too, on many occasions, had the aspect of ignoring call for a captain's meeting or the will of the Central 46.

Toshiro: That's not just the level of arbitrariness.........

Kyoraku: Anyways, the point is the name, "Kenpachi," is a kind of special rank in the realms of Seireitei.
Narration: Looking at the skies under the shadow of his hat, Kyoraku mumbled on as though he was looking back at his past.

Kyoraku: Now that I think about it, Azashiro-kun could have become the Kenpachi for the purpose of seeking after, "it."

Narration: Azashiro, the disappeared 8th Kenpachi as well as the one without the sword. Treasonous sinner Azashiro Kenpachi.....The past that Kyoraku alone looks back....All the facts are to be revealed from the novel!

Spoiler for Spirits are Forever With You Vol. 2:

Narration: The 2nd part of the "Bleach" full-release plan, "Missing Link Project."

Who is the one whom Aizen, who was captured after the final battle of "Ichigo vs. Aizen," had met in the prison?

Comment: I've stressed upon Kannonji, Aizen, or the woman who had donned the skull mask from the right illustration page about many things. I appeal my thanks to Kubo-sensei, who had granted me of such honor. I will work hard so that you, readers, can enjoy my kind of Bleach.

Mugen, the endless darkness, where the treasonous sinner, Aizen Sousuke, had been confined.

Narration: Aizen Sousuke.

The one who is shinigami and at the same time the king of hollows.

By anointing himself as the conqueror of the Hueco Mundo and having acquired the powers of hogyoku, the treasonous sinner had made an attempt to fell the Spirit King. Starting with the Kurosaki Ichigo and at the hands of shinigami, his ambitions had been crushed; now he had been thrown into the Mugen with the body of an immortal. Sokyoku, the tool for executing shinigami, had been destroyed. Even if such a tool had been kept, however, killing Aizen, who had acquired the body of an immortal, is impossible. He, having been restrained by bakudo, not only his hands and feet, but both his eyes, ears mouth, and even the sense of his skin, is now captured by the darkness deeper than the darkness itself. But, the portion of his senses are released without a cause. Without any warning, the seal over one of his eyes, ears, and his mouth was cancelled out, thus the portion of the cloth that which had been used as a means of medium for the Kido had fallen off. What had been reflected in the eye that had arisen from beneath the black cloth was the absolute darkness. However, a soft light emerged and appeared from that darkness. A torch, something that cannot exist within the realms of Mugen, had been radiating light unto his chair-bound self. The body which had been fused with the hogyoku had quickly adjusted his eye, an eye which had not seen light ever since his imprisonment. Then, Aizen noticed a man standing in front of the torch. Even when seeing something that which should not be seen under normal circumstances, there's no signs of surprise or defeat in Aizen's eyes. Rather, as if he had been expecting things to turn out like this, he calmly displayed a thin smile on his face and went on to mumble.

Aizen: My, should I say something like, "It's a pleasure to meet a senior convict?"

Narration: Fluent words. For a normal person, if his mouth gets sealed for over a year, it takes some time for that person to regain senses to his tongue or neck, and at first it would be hard to make sounds out of his neck even.

Narration: There's no change from the time before his confinement, any resentment in himself being confined, and not even remorse for what he has done, however, in Aizen's speech. With a natural stance, Aizen pointed an eye that may see through everything towards the man before him.

Aizen: What should I refer to you as, my friend; by Azashiro Soya, your original name, or respectfully the title that is granted to the greatest shinigami in the Soul Society?
Narration: Aizen, whose entire body is still sealed, and the man before him, who is not bound in any manner at all; undeniably, the latter would be in an advantageous situation. Aizen, with no signs of cowering before the man, as though he has seized control of the place, took the name of the man lightly.

Aizen: 8th captain of the 11th division........Azashiro Kenpachi.

Narration: Azashiro Kenpachi. A woman who draped herself with a white clothing has put out her face from the back of the man who had his name called onto by Aizen.

Woman: Kyhaa! Kyhahaha! Would you look at this! This bastard! This bastard called Aizen! He never becomes anxious! His mood suddenly became brighter! His eye, ear, and mouth suddenly became free! The feeling of extreme relaxation!? Is this the power of the hogyoku? This is quite a catch. Awesome! Steal it from him, the hogyoku! If it's Ken, it's possible, right? By slicing this bastard's body from the tip of his feet to the blood vessels of the back of his eye deeply, that is; by tearing reishi entirely with nothing but the powers of hogyoku left for you to steal! Kyhahahaha! Kyhahahahahahaha!

Narration: Letting out the sounds of her tongue, woman laughed frantically in her joy. Aizen, however, has kept a thin smile on his face without responding to the woman's abnormal taunts. Keeping his eyes opened slightly, Azashiro mumbled on with a voice only the woman could hear.

Azashiro: You stay quiet.

Narration: Then, turning his attention away from the woman, whose hands have covered her mouth in an exaggerated manner, to Aizen, he answered with a softer voice.

Azashiro: If you know about me, it would make the story pleasantly short.

Narration: Without introducing himself, Azashiro composedly spoke.

Azashiro: To make sure that I don't get an answer that has no value, I will say this before we begin......I do not take an interest in the sins you've committed, nor do I care for the power of the hogyoku. I only want to ask you of a few things about the outside.

Aizen: Isn't this an overestimation? (By "overestimation," he means the knowledge that Aizen himself possesses of the outside world.) To the man, who would see everything that happens in the Seireitei and whom Kyoka Suigetsu would be rendered useless, I see nothing to tell.

Narration: Azashiro, too, did not think of Aizen, displaying lax attitude, as obnoxious and, again, went on to question him.

Azashiro: What I want to ask you of is the knowledge beyond the realms of Seireitei. Even if I were to sound disrespectful, you being defeated by Kurosaki Ichigo was something unexpected. I will eventually go on to ask about this event as well.
Narration: Then, the woman whirled her arms around Azashiro in a flirty manner while she snorted.

Woman: Kyhit! You had told me, "Aizen's assault will be put to an end by the zero division, with a serious expression!? After all, he didn't make it to the zero division's blockade. Aizen! You must be embarrassed at the fact that your expectations did not meet your quota. You know, tell me about what you are thinking right now. Thanks? Pwhahaha!?
Narration: The woman of the white cloth was hurled instantly onto the floor near where Aizen was. Aizen, however, did not turn his sight to the place where the woman had fell, but the floor in front of himself to answer Azashiro, who had told Aizen, "I want to hear about your defeat.", while he snickered.

Aizen: Ah, defeat. If I were to bring up the chaos I'd felt at the time of my defeat, I can admit that that, too, in its own ways, could have been a meaningful experience. You should experience it as well.

Azashiro: The feeling of defeat cannot be understood by the one such as myself.

Aizen: To you, that may be the case. Do you have the desire to discuss about the difference between each viewpoints?

Azashiro: No, I do not wish to continue to talk about meaningless things.
Narration: Azashiro had stopped Aizen's talks with a claim that Aizen's story "held no meaning" to itself. Aizen, having heard such an answer of his, as if he was happy, twisted his cheek and opened his mouth.

Aizen: I do not mind. I will go along with your questions, for a while.

Azashiro: Thank you. For you, it is a meaningless deal.

Narration: Treasonous sinner showed thanks to the innocent gratitude of a treasonous sinner. Aizen, however, as if he was rejecting his gratitude, turned his attention upwards and said.

Aizen: That isn't so. ........By hearing the details of your questions, I will get to kill time by expecting your actions and results.

Narration: Next issue, too, have been decided to reveal a part of the novel. We've been waiting restlessly!? That character makes an appearance!! Posted on the 25th issue of the Weekly Jump!! The details for that is an episode where a character from the canon sequence meets with an original character from the roof of a certain building!!

Spoiler for Spirits are Forever With You Vol. 4:

Translation provided by verduister from narutoforums.

Amongst the researchers there was no one who could’ve predicted "this" beforehand.

Though perhaps the Institute’s president, Kurotsuchi Mayuri, could have predicted "it" if he had closely examined "it".

But Mayuri was currently absent because of a trial and to the ones who didn’t know what "this" was there was no reason to closely examine the change of reiatsu in the air.

"It" was floating in Soul Society’s airspace --- Far thinner than the silk thread of a silkworm: an invisible thread of Negación. No one in the Institute knew of its existence and it proceeded to stretch out and crawl into the institution.

As if watching the tendrils of a morning glory grow at high speed, the thread of Negación stretched out further and further, staying glued to the walls.

But when it entered a room filled with countless computer units and hastily working researchers, the thread stopped moving.

And then ----

"Oh, for the love of--, what’s up with these Arrancars!? They don’t seem to be taking along weak Hollows and all of their movements are out of control!"

In contrast to Hiyosu and his shouts of frustration, Akon muttered calmly as he looked at the footage that was sent in.

"It really looks like a meeting of little brats."

"Oooh, there are some cute girls too! I wonder if we can capture a few of them alive..."

Niko, eyes shining behind his glasses, muttered inappropriate comments but his hands slid over the keyboard at a high speed as he processed the incoming data.

The other members also analysed the data with their hands and eyes while letting their mouths move fluently.

"Speaking of female Arrancars, what happened to that weird Hollow in Karakura Town? This group of Arrancars also came via Karakura Town. Is there any connection?"

"Kurumadani is tenacious when it comes to reports, isn’t he? It hasn’t been settled yet. The President got interested and tried to send Nemu-san over there to investigate but then he got called to court.."

Akon scolded the members for having such conversations.

"That’s enough pointless talk. In this situation the trial will be dropped anyway. Hurry up and collect all the data before the President comes ba---!?"

At that moment a chill ran down Akon’s spine and his words got stuck in his throat.

They noticed it.

Somewhere in this observation room an ominous reiatsu was welling up.

Then, the member with the lowest reiatsu sensory skills started shouting while looking at his monitor.

His entire body froze as he shouted. At the exact moment he finished double-checking the information on his monitor, he felt the sensation that filled the entire room.

"Wha... Its location... I-It’s inside this.... room."

The members all broke into a cold sweat and no one in the room made a single move.

But from a desk at the back of the room came the sound of someone steadily typing away at a keyboard.

None of the members were typing. After all, that desk was the President’s desk. There was no member so suicidal as to dare use the President’s computer. And of course the reiatsu pouring out from there was completely different from the President’s reiatsu.

When the members, Akon first, slowly looked towards the desk---

A final pang rang through the room as the typing stopped and the man who was suddenly sitting behind the desk opened his mouth with a small smile.

"Oh my.... The man who killed me is this place’s President?"

Staring at the data on the monitor the male Arrancar with a glasses-shaped mask spoke to the members in a voice that made his intelligence apparent.

"H-hey, he..."

"He’s the specimen that was kept in the back of the warehouse, preserved in fluid....?"

Specimen.

The moment he heard that single word, the Arrancar narrowed his eyes and suddenly started yelling with an ever so small smile lingering on his lips.

"Specimen....Ha! I became a specimen! Though it’s true I lost for the moment, that is simply a disgrace beyond all imagination! Be it as a corpse, my body actually ended up on the observed side!"

---- This is bad.

Akon pondered to himself as he watched the unstable-looking Arrancar.

---- That specimen and this guy are the same person.... If I assume he’s "something" that at least possesses the same powers...

---- He... was one of the Espada, wasn’t he?

{ Sz... }

Nearly at the same time that Akon and the others remembered the name written on the specimen’s label, the Arrancar slowly rose from his seat.

"How about you show me that "specimen" right now? After all, it’s extremely rare to get a chance to observe my own corpse. Well, I don’t clearly remember the moment when I died in the Living World."

I look forward to discussing some of these volumes with those of you who are interested. The discussion between Aizen and Azashiro Kenpachi in particular intrigues me greatly. It'll be interesting to see how these events may tie in with the canon plot (if at all).

I'd agree that what's written doesn't necessarily give away a whole lot or reveal answers to many unsolved mysteries. But the interesting bits still seem discussion worthy nonetheless. For instance, Azashiro Kenpachi betrayed SS and was captured 200 years ago. This time frame also coincidentally coincides with the events of the Quincy massacre. Could there be a connection?

Azashiro Kenpachi's zanpakuto also seems interesting. Based on the hints given within the first 2 volumes, it sounds like it could have quite an OP ability--perhaps even moreso than Kyouka Suigetsu. It's an ability that almost sounds like it can be everywhere and yet nowhere at the same time while allowing its wielder to perceive things far beyond the normal range. With that said, he might be hiding in some deep dark corner within the sereitei right now watching this war unfold waiting for his opportunity to make a move.

We now have confirmation (for anyone that was ever in doubt) two things.
The first being that Aizen is truly immortal. They can't sentence him to death, because he can't die. The second thing it kind of confirms is that the hougyoku is still under his control since we know it grants his body the ability to adapt to extreme conditions. So since this is the case, Aizen could still very well become a threat if he's freed.

And finally, its revealed that Espada number 8 came back somehow. How might this affect things I wonder?

This is all just off the top of my head. I haven't even considered possibilities for anything else. Case in point, we have here an ample amount of material to speculate with should anyone be up for it.

Because it doesn't make any sense? I mean aside from the fact that none of the good guys ever dies (plotkai), but to actually give just this guy who doesn't really even need it? Through a thing that's simply a "science ball"? (hougyoku). Though it could just be a giant target meant to have him killed through some other means in the end for all we know.

Because it doesn't make any sense? I mean aside from the fact that none of the good guys ever dies (plotkai), but to actually give just this guy who doesn't really even need it?

He did kind of need it though. Kubo's been pretty good about killing off the bad guys for the most part. Because the arrancar saga introduced tons of them. And only a very small number made it out alive. What's more is that, some of the so-called "bad guys" turned out not to be so evil to begin with. So if popularity, redeeming traits, and qualities alone couldn't provide enough plot armor to spare some of those old antagonists, then by all means Aizen had every excuse to get killed. Afterall, he was king of the bad guys. Even now, he hasn't seem to gain any redeeming factors that would've otherwise made him worthy of having his life spared by dumb luck alone (as was the case with Harribel and her fraccion). So yeah...I guess Kubo figured Aizen needed a solid excuse to live through the war. He clearly wants to make use of him again. But at the same time, he knows very well that Aizen was the last person who deserved to get out of that war alive. That's why he needs the Hougyoku (more than anyone else). Right now, it's the ultimate plot armor. So it naturally, needs go to the guy who deserves to get killed off the most. That's how I look at it anyways.

I think I see you point, but it just seems more badass if he just lived out of sheer tenacity or smarts (like taking Ichigo's last attack at a certain angle or something to barely escape alive). So if he simply lived because of plotkai alone, I think it sounds better than 'because he's immortal now.'

So now that a couple volumes have officially been released, it seems more info has come in. Granted, I think I read something about this novel being well over a few hundred pages, so if we're to ever get a full translation, it won't be for quite awhile, I'm sure. But nonetheless, a few interesting bits of info have been provided by various people. However some of this sounds pretty suspect though. So take it with a grain of salt until more reliable translations come in.

First I'll start off with a post provided by czeliate from BA:

Spoiler for synopsis of a few Shien and a few Kenpachi's:

Warning: This is just a comment/spoiler provided by Japanese fans, it could be a fake one, but 7th gen, シエン, and 8th gen's info sounds ok as other bloggers also mention it.

Kuruyashiki Kenpachi (7th Generation Kenpachi)

A stalwart that induced by zero squads. (don’t know how to translate)
His bankai “饿乐廻廊” ability is to destroyed/crushed all living things and non living things within the area of certain radius ( several times bigger than Karakura Town).
But once he have use it, he can’t release it within half a year
(meaning, he only can use his bankai once every 6 months)
During his battle with Azashiro Kenpachi, Shunsui and 11th division members were there, so he did not use his bankai.
According to 46 chamber, his bankai is forbidden in Sereitei, but the problem is his shikai is extremely powerful as well.

(シエン) Shien? who?

Szayel apporo’s complete backup person (?) who was once an espada.
He acquires information from Illforde that can surpass the power of Yammy- 0 espada.
Among the espada in the beginning , the number is 0.
After eating up Szayel Apporo- who has fallen to hell, his body will collapses during the battle because his presence is still incomplete.
Ishida (another forum user) says during his battle with Kenpachi, his reiatsu is the same as Hichigo.

Azashiro Kenpachi ( the 8th Generation Kenpachi)

His bankai ability is (融合) “fusion/merge” , and the area is the entire of Sereitei hence he is able to see through all situation and to hear everyone’s conversation.
Besides, he can produced a blade/razor from the air, killing his enemy with no motion. (eg: the moment his enemy releases shikai, he chops down his enemy’s tongue)
Finally, he has an ultimate attack call “ living body fusion” (生体融合), by opposing his enemy he can destroy his enemy’s internal body, an attack that even can damage himself.
Kuruyashiki Kenpachi was defeated by this attack.
As for defensive, Azashiro can fused with the air, hence all the slash from his enemy has no effect on him.
Every captain class shinigami from the past attacks him with their move (not include Uki and Shun), but Azashiro did not receive any injuries.
However, he surrendered when noticing an intervation from the Zero squads.
It seems like there is a different level between the Zero squad and Captain.
Because he can imitate/copy his mouth and hands within each spaces, he is able to chant hundreds of “ittokaso”, “kurohitsugi” level kido at the same time.
Also, when he saw the battles betweenシエン(Shien) who has the same reiatsu as hichigo and Kenpachi, he says : “only this level? Well then, I have the advantageous”.
His weakness is the involvement of Yumichika and Quincy’s reiatsu absorption which he will receive the damage. (unsure of this part)
Due to low physical specs, he is unable to train in his bankai. (again not sure)
He takes about 1 year to fully understand and to dominate sereitei.
He takes about 2 days to sees through Kyouka Suigetsu.

Noticible highlights:
-7th Kenpachi had an extremely destructive bankai that's use was forbidden. However, if used, it would take 6 months to recharge.

-Shien is supposedly a privaron espada who ate Szayel's soul in hell to obtain his powers. I think this might be the actual being introduced in the 4th volume. It's not actually Szayel. His power seems to surpass Espada #0 and is on par with Ichigo's perfect hollowfication form.

-Whereas Zaraki and Ichigo both have constant shikai released zanpakuto's, the 8th Kenpachi seems to have a constant bankai released zanpakuto. And from the sounds of it, it seems EXTREMELY OP. After his initial betrayal 200 years ago from the Gotei 13, intervention from Squad 0 was needed before he was finally willing to give up.

according to kubo, when he draw bleach, he leaves few secrets in the manga that he expect few readers to notice.

there are total 4 levels of secrets

first level is the easiest, he expected every reader to be able to notice it
the second level is a bit harder, about 1 in 4 people to 1 in 10 people can notice it
the third level is even harder, probably only 1 in a thousand can see though it

now, to the last level, which according to kubo, is something he put in from the beginning and something he intend to reveal in the grand finale of the manga, something he thought no one would be able to decipher
and that is... ZARAKI's TRUE POWER LEVEL

when kubo read the ending part of the novel(the climax of the battle between zaraki and that 8th kenpachi), he said he was so shocked that Narita actually understood his bleach to the core and saw through zaraki's true potential
apparently he was so excited and happy that he read that part over and over again...

so, yeah, kubo was planning to reveal zaraki as uber powerful at the end of the manga, but somehow this Narita guy spoiled us...

below are the few feats of novel zaraki. Again, it's from 2ch, so whether to believe it or not is up to you

Apparently, a scanlation of this particular segment has been provided.
Here's the next part of Ano's post:

apparently Zaraki has always been this powerful, but his special ability (or should i say handicap) is to automatically adjust his power level to his opponents, so he'll enjoy the fight longer.

there are only two person aizen didn't want to face before acquiring immortal body from break sphere, one was yama, so he create wonderwise so specifically counter him, the other one is zaraki, so aizen lured him to hueno mueno by kidnapping orihime.

zaraki's riatsu severs as a defensive armor that protect him from all sorts of hax

acording to shien(the enhanced version of sayza appolo, the one with same amount of riatsu as h2 ichigo), when zaraki's fighting him, zaraki's strength at the moment is so strong that he could easily blow away baragan's respia and stark's wolves. (and since zaraki's riatsu=shien's riatsu=h2 ichigo's riatsu at this moment, i suppose h2 ichigo can also do this. maybe that's a confirmation that h2 ichigo is stronger than all other Espadas?)
Shien also used the voodoo doll on zaraki, he created dozens of them, but all of the dolls were too hard for him to break, so yeah even if you have same amount of riatsu as zaraki, your hax still won't work on him

during the fight between zaraki and 8th kenpachi, he endured hunreds of itto kaiso without much of damage. Even 8th kenpachi's ability, whichi fuse himself against his opponents and break their bodies from inside, is nullified by zaraki's riatsu.
and finally, in the final bout between zaraki and the 8th kenpachi, none of the other spectators were able to sense their riatsu, which may suggests that both zaraki and 8th kenpachi are at transcendent level (at least in this final moment)

oh, and the amount of riatsu his eye pad now absorbs is 10 times more than before the time skip...

Highlights of the above:
-Zaraki's so powerful that we're supposed to believe Aizen intentionally lured him into HM during the war for the sake of avoiding a battle with him.

-According to Shien, Zaraki's so powerful, that he could easily blow away Barragan's respira and Starks wolves. Shien also apparently tried to use Szayel's voodoo doll trick multiple times on Zaraki, but to no avail since Zaraki's organs are too hard.

-Finally, Zaraki's OP reiatsu makes him practically immune to all hax--which allows him to defeat someone as powerful as the 8th Kenpachi. So yeah...if this is to be believed, Ken can even endure a blitz composed of hundreds of 90's level hado spells. That $*** sounds nuts.

The 8th Espada’s story .
A long time ago there are 2 brothers. The elder brother is chief of army while the younger brother is an alchemist.
The elder brother defeats his enemies during the battle, he then brings his defeated enemies to his younger brother and serve them as a “material”
As time passes, the younger brother has treated numerous human as a material for his experiment.

One day, these brothers suddenly dies and became a hollow.
The younger brother saw his own rotten corpse when he became a hollow, he was very excited.
As a result, he ate his elder brother and other souls that he was experimenting.
Later, he continues to eat other hollows and finally became humanoid, he took down Vasto Lordes.

The name of the younger brother is : Szayel Apporo. During the battles he often limit his own strength in order to capture a live “material” (capture something live and treat as a “material)
Hence, he accepted barragan’s call/invitation and became a researcher.

Later he became a member of Espada that was created by Aizen, his number is “0”, which is the strongest among the espada. However, Aporro still not satisfy with it, in order to study the perfect of life, he complete his “Annunciation” power and separate himself into 2, successfully degrade himself into an Adjhucas.
The other separated body is Grimmjow’s fraccion- arrancar no.15 (illforte). As Aporro degrade into an Adjhucas, his strength declines substantially, hence detach from Espada members.

However, after completing the secret technique of reincarnation call “Annunciation”, he regains his position back as an Espada and was given a No. “8”

Hax aside, it looks like the author of this novel might be trying to use this project to tie up some loose ends and explain some inconsistencies. Zaraki in particular has been the focal point of many fans to highlight power level inconsistencies throughout this series. So now the answer we're possibly looking at to explain his sudden leaps of strength (despite very little training) comes down to an actual ability--an ability that allows him to match his opponents strength for the sake of prolonging a duel. In fact, I'm seeing a lot of people across various message boards coming to the same conclusion. That being Zaraki's actual undefined power level could reach somewhere within the vicinity of Ichigo's transcended mugetsu level. But his zanpakuto's ability (whether he realizes it or not) sort-of auto adjusts his reitasu down to match his current opponents strength.

Either that, or reitasu so powerful, that you can simply power through anyone's hax abilities. At the very least, this is finally giving some credence to the name of "Kenpachi"--a title handed down to each generation's strongest shinigami. For the longest time in this series, there seemed to be a few too many shinigami characters who's strength contradicted the purpose of that title. It got to a point where it felt like the title itself was just for show.

Spirit power > abilities of less spirit power. It actually kinda makes some sense. Within its fictional context perhaps...I mean even kevlar won't protect you from a full clip of a rifle to the chest point blank.